Calcium hydroxide is affirmed by the FDA as a generally recognized as safe (GRAS) direct food substance (21 CFR 184.1205).

Prolonged contact with wet cement, which is alkaline due to the reaction of water with calcium oxide to form calcium hydroxide, can result in full-thickness skin burns that may require surgical treatment.

sampling media: Tared 37-mm diameter low-ash polyvinyl chloride filter preceded by 10 mm Nylon Cyclone maximum volume: 816 Litersminimum volume: 408 Litersmaximum flow rate: 1.7 L/min current analytical method: Gravimetric method reference: OSHA Analytical Method (OSHA PV2121) method classification: Partially Validated note: OSHA personnel can obtain tared sampling media from the Salt Lake Technical Center. note: If the net weight of the sample yields a concentration below the standard for the substance, the Salt Lake Technical Center will perform no further work on that sample. If the net weight corresponds to an amount greater than the standard, the sample may be analyzed for the appropriate element and the result reported as the substance. current elemental analysis method: Atomic Absorption Spectroscopy; AAS method reference: OSHA Analytical Method (OSHA ID-121) method classification: Fully Validated note: Submit as a separate sample. When analysis of a compound is requested, an elemental analysis is performed and reported as the compound. The analytical method does not distinguish between dust and fume.